Defining black ice

Traffic reports often make mention of black ice during the colder weather. It can certainly sound ominous, and it's often very dangerous. But what exactly is black ice?

Black ice is a thin coating of ice that forms on roadways and other surfaces. It often occurs from freezing drizzle, wind-blown snow or freezing condensation. Because black ice is so thin, the ice appears to be the same color of the surface material beneath the ice. Therefore, on asphalt roads, the ice can be nearly invisible and black in color -- hence the name. Unlike snow or ice that is readily visible, black ice is very hard to see, which makes it very dangerous for motorists.

Drivers should treat wet-looking roads with caution during the cold weather. What may appear to be water is often black ice. Traction is limited on ice, so spinouts and accidents may occur if the driver is not careful.